Journal
COMPOSITES PART B-ENGINEERING
Volume 45, Issue 1, Pages 440-448Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2012.05.056
Keywords
Nano-structures; Mechanical properties; Hydration property; Electron microscopy
Funding
- Infrastructure Technology Institute at Northwestern University [DTRT06-G-0015]
- Tennessee Valley Authority (TVA)
- Oak Ridge Associated Universities (ORAU) [105866]
- China Scholarship Council
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To understand the effects of colloidal nanoSiO(2) (CNS) on cement hydration and gel properties in the early and later age, hydration heat, calcium morphology, hydroxide content, non-evaporable water (NEW) content and nanoscale mechanical properties were measured. Some comparison studies were conducted on silica fume (SF) paste, as well. Results revealed that the accelerating effect of CNS on hydration in the early age is achieved by the acceleration of cement dissolution and hydrate nucleation on reacted nanoSiO(2) particles. Although cement hydration can be greatly accelerated by CNS in the early age, its later age hydration is hindered. The NEW content of CNS-added paste experiences a higher rate of increase initially, but gradually becomes smaller than that of the control paste due to changes in the gel structure, making NEW content an unsuitable method for monitoring the hydration of CNS-added paste. However, nanoindentation results revealed that CNS modifies the gel structure to increase the high-stiffness C-S-H gel content. (c) 2012 Elsevier Ltd. All rights reserved.
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